The goal of this research is to find out the correlation between (1) reading interest and reading skill; (2) grammatical competence and reading skill; (3) reading interest, grammatical competence, simultaneously and reading skill. This is a correlational research method which is a kind of a quantitative research. The population of the research is the second grade students at one of Senior High School in Surakarta in the Academic Year of 2021/2022. The samples are 22 students of XI MIPA using cluster random sampling. To collect the data, the researcher used grammatical competence test and reading skill test. Meanwhile to collect the data of students’ reading interest, the researcher used questionnaire. The results of this research show that: 1) there is a positive correlation between reading interest and reading skill (rx1y) is 0.761; 2) there is a positive correlation between grammatical competence and reading skill (rx2y) is 0.865; and 3) there is a positive correlation between reading interest, grammatical competence simultaneously, and reading skill (Ro) is 0.882. Thus, it can be inferred that reading interest and grammatical competence are valuable factors in influencing students’ reading skill.